Planoqraph co



E. C. MORIARTY.

FLUID RECOIL BRAKE FOR GUNS.

APPLlcAloN FILED APR. 16, "1919.

2 SHEETS--SHEET l.

Patented July 15, 191.9.

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THE COLUMBIA PLANoaRAPl-l C0.. wASHlNu'roN. D. c

E. C. IVIORIARTY.

FLUID HECOIL BRAKE FOR GUNS.

APPucATioN FILEDAFR. 16, 1919.

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Sme/whois .Waag

THB coLuMBl'A PMNDGRAPH co., WASHINGTON. D. c.

- i? UNITED sTATEs PATENT OFFICE.

ERNEST c. MOEIAETY, E THE UNITED sTATEs ARMY.

` FLUID EEcoIn-BEAKE Eon GUNS.

Specification of Letters Patent. Patented July 15 1919.

Application filed April 16, 1919.

Serial N o. 290,597.

(FILED UNDER THE ACT 0F MARCH 3, 1883, 22 STAT. L., 635'.)

Y To all whom t may concern.'

Be known that'I, ERNEST C. MoRrARnr, Lt., Ordnance Department, U. S. A.,a' c1131- Zen of the United States, stationed at Washv`ing'ton, D. C.,have invented an Improvement yin Fluid. Recoil-Brakes for Guns, of

.which the following is a specification.

V,The invention described herein may be nsed by the Government, or anyof its oflicers or employeesv in prosecution of work .forftheGovernment, or by any other person inthe'United States, without paymentof any royalty thereon.

lmy co-pending application, Serial y Number 290,596, `filed of even dateherewith,

`"J1" have 'disclosed a form of fluid recoil brake 'f mechanism for.heavy ordnance guns in i which the brake. piston is elongated andprojectsv a substantial distance beyond one end ofi/the brake cylinder.With some type of guns, it is disadvantageous to have the pisi ton:project beyond the end of the brake cylinder, and it is, therefore, theobject of this yinvention to provide a fluid recoil brake in `which,while preservingV the objections and "advantages `aimed at 1n theinvention of saidfco-pending application, it will be possible toeliminate the'projecting portion of y, said piston, or materially reducethe length thereof, so that the actual length of projection will beunobjectionable.

To this end, theY invention comprehends,

finte/'r' alia, a fluid-containing brake-cylinder,

. inwhich moves a brake piston communicatk lng asusual with ythedisplacer-cylinder 1n which moves afloating or free piston, said fbrake-piston being encircled by an indelpendently longitudinally-movableY y sleeve lprovided with a' longitudinal concentric chamber, the innerwall of said chamber,

at one ,end thereof, being provided with throttling ports and ther outerwall, at the otherl end of said chamber, being transversely slottedwhereby said chamber is -open at this end so as to communicate with thespace between said sleeve and the wall of the brake cylinder. 1 Theaccompanying drawing discloses an kkexemplary embodiment of theunderlying principles of my invention. Like reference characters denotecorresponding parts in the several views. In the drawing: l

Figure 1 is a section on the line 1 1,

Fig. 4 of my Huid recoil brake, showing the in-battery position of theparts;

`the brake piston3 provided with the `piston rod 4.-, which 1s connectedin the customaryv manner with the gun, so as to move therewith uponrecoil and return. For the sake of lightness, saidpiston may be hollow,as shownat 5.

Encircling said piston is a tubular sleeve comprising, preferably, ahead 6 andan elongated concentric nec-k 7 of lesser diameter. The headcarries internally thereof a vpacking 8 encircling the piston 3: Theneck 7 internally carries` at the end thereof'remote from the head 6, apacking 9 encircling the piston rod 4.

The head 6 is encircled by and works through a `packing 10 carried bythe brake cylinder, at one end thereof.

A similar packing 11 is carried by the other end of the cylinder l andencircles the neck 7 of the sleeve.

It will thus be noted that. whereas the pa'ckings 8 and 9 move withthehead 6 and itsneck 7, the packings 10 and 11 are fixed or stationaryrelative thereto.

The neck 7 of the sleeve is provided with a. concentric longitudinalchamber 12 eX- tending, preferably, fronrthe end of the sleeve adjacentthe head 6 to a point short of the other end of the sleeve. At one endof said chamber adjacent the head 6, it communicates, as shown at 13,with the space between the outer surface of said sleeve and the wall ofthe brake cylinder 1. Adj acent the closed end of the vvchamber 12, theinner Wall thereof is providedk With throttling ports 14.

The brake cylinder ll containsrasfusual, a suitable brake f1uid,'suchva'sglycerin or oil, the fluid lnormally filling the same.'

encircle the piston rod 4, and may be secured'in a suitable manner so',as to movey therewith.

piston V3n andVY sleeve 7"V will travel tothe right in Fig. 1, but atdifferential speeds,

the piston traveling more rapidly than the sleeve.

through the ports 14, the travelof thefluid the displacer chamber, forva purpose IWell known.l As the piston travelsjto theright in Fig.l 1,it successively closes passage through the throttling ports 14,'andxthusthe trapped fluid brakes the piston.v

In compliance 'with' the revisedfstatutes of the 'United States relatingto patents, I

have ydescribed, with great particularity, a

vconcrete or physicalembodiment of my vention, itfbeing understood thatthe disclosure is merelyillustrative land that lthe invention issusceptible of many changes.

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent ofthe United States 1. "Inf a fluidbrake'forguns, a brake cylinder, a piston moving therein, an independentlylongitudinally movablev sleeveencircling said piston and vhavingaflongitudinally extending chamber communicating'at one'end thereof withthe .space interiorbf said sleeve and atthe othery end thereof with thespace outside of said sleeve.

2. In a Huid brake for guns, a brakecylinder, a piston moving therein,and anv iiidependently longitudinally movable sleeve encircling "saidpiston ,andv havingA a longi-v extending concentric chamber f tudinallycommunicatingat one end thereof with the space interior of said'sleeveand at the other end thereof with the space outside of'said 3." Ina fluid brakefor guns, agbrake cylvinder, a piston movingtherein, andLan' in-' 4tudinally extending chamber communicating at one end vthereofv v`it'l i the spacev in- T'he oil or glycerin thus displaced by themovementy of the :piston escapes dependently longitudinally movablesleeve said piston andsleeve traveling at dii'erential-speeds. i f v 4.Ina fluid ybrake for guns, a brake cylinder, a pistonv moving-therein',and an in- If desired, a disk 15 may'`'.conceiitricallyy dependentlylongitudinally movable sleeve;

tudinally" extending chamber communicatl ing at one end thereof vvith`the space inf: In operation, upon recoil ofthe gun, the" terior of`V4said sleeve and at theothe'r end 5. In a fluid brake for guns, abrakecylfinder, a pistonmoving'` therein and an'independently j.longitudinally movable" sleeve encircling saidpiston-and having alongi-vr terior ofsaid sleeve vand at Hthe other end thereof Withthespace outside of said sleeve,

gated neck.

6.k In afluidibrakefor guns, a brake cylinder,:a pistonmoving therein,andan -inencircling Ysaiol'piston rand having alengi-y tud'inallyextending chamber communicatjing at 'one'v end thereof Withf'the.'spacfe"inf 1` terior of said rsleeve and` at `the other e'njd4 thereofwith the Space Voutside o f .said

sleeve, andstationary `packingsv carried by enc1rcl1ng, .said

said brake "cylinder and sleeve. .7. In a `iuidpbrake for guns, a brakecyl.-

inder,` a piston moving' therein, anind'ependently longitudinallymovable sleevefencircling said piston and having a longitudi-- f nal'lyextendingV chamber communicating'at one endlv thereof, .with the space'interior fof vsaidfsleeve andjatf thezotherV end thereofrv vWith thespace outside ofsaid'isleeve,v and packings interiorly carried by lsaidsleeve *and encircling said piston.

8. VIn a fiuidfbrakeffori guns a' brake cyl-L nally extending chambercommunicating at one end'rthereof WithH thespace interior yof interiorlycarried bysaid sleeve and encircling said-piston. l

. ERNEST' c- MOR-MRT?.

Copies orfthispatet may I Je'` btainedl'l'or ve celu-ts each, byaddressing the (.loxnmissione;` ofraltents, i Washington, D. 0. f

gtudinally extending chamber communicat- 5 ing atfone end thereof withthe space in-"' f. i

said sleeve comprisinga head` and an: elonvinder, apiston movingtherein, an independl vsaid sleeve. ancbat the-'other end thereof Withthe space outside .ofi said sleeve, st av tionary packings Vcarried bythe brake cylinder and encircling said sleeve, and packv

